Typewriting machine



April 8 1924. 1,489,604

' A. G. F. KUROWSKi TYPEWRITING MACHINE Patented Apr. 8, 1924.

UNITED STATES PATENT OFFICE;

ALFRED G. F. KUROWSKI, OF BROOKLYN, NEW YORK, ASSIGNOR TO UNIDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE TYPEWRITING MACHINE.

Application filed April 30,

in Brooklyn Borough, in the county Of" Kings, city and State of New York, have invented certain new' and useful Improve ments in Typewriting Machines, of which the following is a specification.

1 ing machines, and, more particularly, to means for preventing printing a ainst the platen while the latter is being s ifted between lower and upper-case positions, so thatv a sluggish movement of the shifting mechanism, or a premature operation of a typekey may not result in the production of an impression which is out of alignment or blurred.

It is a feature of this invention to provide a simple-and efficient means for accomplishing the above objectwith a minimum change in the construction of a standard typewrit ing machine. For this purpose, means are provided for preventing actuation of the universal bar while the shifting operation is in progress, thus arresting the type-bars V before the types can print against the platen. Other features and advantages will here inafter appear.

In the accompanying drawings,

Figure 1 is a vertical section of an Underwood standard typewriting machine, with the invention applied thereto, the laten being shown in upper-case position, an only the necessary co-operating parts of the machine being shown.

Figure 2 is a view similar to Figure 1, with additional parts of the machine'ineluded, but showing the platen in lowercase position.

Figure 3 is an enlarged detail, showing the inv'ention and a few co-operating parts of the machine.

Figure 4 is a view similar to Figures 1 and 2, but showing the platen in anintermediate position, between upper and lowercase positions. 5

In the Underwood standard typewriting machine,key-levers 10 actuate bell-cranks 11 to swing type-bars 12 upwardly and rearwardly. against a platen 13, said type-bars.

carrying types Hand 15 for printing in upper and lower case. Said type-bars are. each provided with a shoulder 16 for striking against a universal bar 17, near the end 1921, Serial No. 465,894.

of a stroke, to operate the. escapement-actw ating frame 18 ,pivoted at the rear on arms 19;;and 20, fixed to a shaft 21 journaled in the escapement-supporting frame 22. A rear bar 23 of the cscapcment-actuating frame strikes against a fixed dog 25, and rotates a shaft 29, upon which said dog is mounted, to release a movable dog 26, also The present invention relates to typewritmounted upon said shaft 29, from escapement-wheel 27, so that, upon return of a type-bar, the carriage 30, in which the platen is mounted, will be fed to the left a distance of one letter-space by means of a pinion 31 meshing with a rack 32 on the carriage.

The-platen is journaled in a platen-frame 35, which is held by arms 36, pivotally mounted at 37 on the vmain carriage,-fran'ie 30. For shifting the platemframe and platen, the former is provided with a roller 38, operating on a rail 39 fixed to a swingable frame 40 pivoted at 41, said frame being operable by a finger 42 extending upwardly on a key-lever 43, similar to keylevers 10, and provided at its forward end with the usual shift-key 44. v

The present invention provides means for preventing actuation of the universal bar, and hence printin of the types against the platen while the p aten is shifting from one case to another. For this purpose, there is provided an arcuate member 50 at the end of an arm 51, pivoted on a; bracket 52, fixed to the escapement-supporting frame 22, and an arm 53, fixed to shift rail 39, and having a pin-and-slot connectionfi with arm 51; so that, upon shifting the rail, arm 51, and hence member 50, willhe raised, the arcuate member operating direc'tlybehind the bar 23 of the frame 18, to prevent rearward movement of the frame, and hence of the universalobarl'l, Since the type-bars cannot 0 eratesuflicicntly near the platen to enable t e types to print thereagainst, without moving the universal bar rearwardly, it will 199 be apparent that. by preventing such rearward movement of the universal bar, the

types will be unable to print. The arcuate member 50 ei5tends upwardly from" arm'51 a distance such "that, when shift-rail 39 is in its lowest position, the escapemen't-actuating frame 18 may movefreely over the end thereof, as in Figures 2 and While shift-rail 39 is shifting, however, the mem ber 50 ,prevents any rearward movement of 119 frame 18 (see Figure 4), the arcuate member being directly behind Bar 23. When Shifts rail 39 has reached its highest position, the

frame 18 is again free to move rearwardly? such movement being perimtted by a. cut-qut portion 55 in arcuate member 50, (see Figure 1). From the above description, it will be apparent that a type-impression cannotbe made during the operation of shifting the platen,so that it is impossible for a. blurredimpression tobe made or for the printed -characters to appear out of alignment. 1 i I Variations may be resorted to within the scope of the invention, and portions of the im rovements may be used without others. aving thus described my inventi'omvl claim: I

1. In a typewriting machine, the combination with a platen, ofa carriage'therefor,

types having upper and lower case characters the'reon,,t-ype-barsmovable with the types to the platen, an escapeme'ntmechanisin for the carriage, a universal bar in the path pf movement of the type-bars, to be actuated by the latter to operate the escapement mechanism, means for effectinga case shift of the platen with respect to'the types, and means connected to i the case-shifting means and interposed, ,by movement, of the latter,.into thefpath of the universal bar to block the universal bar and thereby to prevent'movement of the typesfto the platen when the case-shifting means is between case positions. i

2. In a typewriting machine, thecombination with a' platen, of a carriage therefor, types having upper and lowercase characters thereon, type-bars movable with the types to the platen, an escapement mechanism for the carriage, a universal bar in the. path of movement'of the type-bars, to be actuated by the lattento operate the escapementmechanism. a frame Ion the"carriage shiftalble with the platen betweennpper and lowercase positions, means for effecting the case-shift of said frame, an arm pivoted to theQmain frame, and a oonncction'from said arm to the shift-frame" for throwing said arm into the path of movement of the universal bar, to block the latter and thereby to prevent movement of the typesbars to the platen when the shift-frame is between case positions.

3. In a front-strike typewriting machine, the combination with a platen, of a carriage therefor, types having upper and lower case characters thereon, type-bars" movable upward and rearward with the types to the platen, an escapement mechanism "for the carriage, a rearwardly and. forwardly movable universal bar in'the path of rearward movement of the type-bars, to be actuated by the latter to operate the escapement mechanism, a frame on the carriage shiftable up and down with the platen between upper and'lower case positions, means for effecting the case-shift of said frame, an arm pivoted to the main frame and interposable into the path of rearward movement of the universal bar, and a connection from said arm to the shift-frame for throwing said arminto the path of rearward movement of the universal bar, to block the latter and thereby to prevent movement of the nation with 'a platen, ofa carriage therefor,

types having upper and lower case characters thereon, type-bars movable with the types tothe'platen, an escapement mechanism for the carriage, a universal bar in the path of movement of the type-bars, to

be actuated by the latter to operate the e capementmechanism, a frame entire carrrage shift-able with the platen between upper and lower case positions, means for effecting the case-shift of said frame, an arm pivoted to the main frame, and a connection from said arm to the shift-frame for throwing said arm into the path of movement of the universal bar, to block the latter and thereby to-prevent movement of the typebars to the platen when the shift-frame is between case positions; said arm being shaped to permit movement of the universal bar and consequently of the type-bars, after full-movement of the arm and shiftframe to upper-case position.

5. In a typewriting machine, the 'combination with a platen, of a carriage there for, types having upper and lower case characters thereon, type-bars movable with the types to the platen, an Lescapement mechanism for the carriage, a universal bar in the path of movement ofthe type-bars, to be actuated bythe latter to operatethe escapement mechanism. a frame on the carriage I shiftable-with the platen between upper and lower case positions, means for effecting the case-shift of said frame, a segmental stop pivoted to the main frame, and a connection from said stop to the shift-frame for throwing; said step into the path of movement of the universal bar, to block the latter and thereby to prevent movement of the type-bars to the platen when the shiftframe is between case positions; the segmen- .tal stop having a recess therein which registers with and permitsmovement of the universal bar when the shift-frame reaches upper-case position.

6.'In a-typewriting machine, the combination with a platen, of a carriage therefor, types having upper and lower case characters thereon, type-bars movable with the types to the platen, an cscapenient mechanism for the" carriage, a universal bar in the path of movement of the type-bars, to

1,eee,ece

be actuated by the latter to operate the es-i capement mechanism, means for effecting a; case-shift of the platen with respect to the types, and means connected to the case-"1 shifting means to engage the universal ban and thereby to prevent full movement of the type-bars, while the case-shifting means is being operated;

7. In a front-strike typewriting machine,

.in combination, a carriage, a platen-frame having a platen journaled therein, an escapement mechanism for said carriage, type-ba1s mounted in said machine, typebar operating mechanism to cause said typebars to print against the platen, said typebars having upper and lower-case types,- means for shifting said platen between uper and lower-case positions, a universal Ear movable rearwardly by said type-bars near the end of a stroke for actuating said escapement mechanism, and a stop member pivotally mounted on the machine and connected to said shifting means and interposed iy said shifting means in the path of movement of said universal bar during the shifting operation, to prevent rearward movement of said universal bar and arrest said type-bars before reaching the platen while the latter is being shifted, said stop member being out of the path of movement of the universal bar in the extreme lower position of the shifting means, said stop having a cut-out portion which is opposite said universal bar in the extreme upper position of the shifting means to permit rearward movement of the universal bar in said extreme upper position of said shifting means.

8. In a front-strike typewriting machine, in combination, a carriage, a platen-frame having a platen journalcd therein, an escapement mechanism for said carriage, type-bars mounted in said machine, typebar operating mechanism to cause said typebars to print against the platen, said typebars having upper and lower-case types, means for shifting said platen between up per and lower-case positions and comprising a shift-rail, a universal bar movable rearwardly by said typebars near the end of a stroke for actuating said escapement mechanism, an arm pivotally mounted on said machine, a stop member on said arm, a second arm fixed to said shift-rail, a connect-ion between said arms so that the sto member moves simultaneously with sai shifting means into the path of movement of said universal bar during-the shifting operation, to prevent rearward movement of said universal bar and arrest said typebars before reaching the platen while the latter is being shifted.

9. In a typewriting machine, the combi nation with a platen, types having upper and lower case. characters thereon, type-bars movable with the types tov the platen, an escapement mecha-, nism for the carriage, a universal bar in the path of movement of the type-barsto be actuated by the latter to operate the escapement mechanism, means for effecting a case-shift of the platen with respect to the types, and a pivoted linkage supported from the case-shifting means and the machine-- frame and swingingly interposed, by movement of the former, into the path of the universal bar to block it and thereby to prevent movement of the types to the platen whenthe case-shifting means is between case positions.-

10. In a typewriting machine, the 'combination with a platen, of a carriage therefor, types having upper and lower case characters thereon, type-bars movable with the types to the platen, an escapement mechanism for the carriage, a universal bar in the path of movement of the type bars to be actuated by the latter to operate the escapement mechanism, means for effecting a case-shift of the platen with respect to the types, and a pivoted linkage connected between the case-shifting means and the machine-frame to engage the universal bar, and thereby to prevent full movement of the type-bars while the case-shifting means is being operated.

ALFRED G. F. KUROWSKI.

Witnesses:

EDITH B. Lmnnv, JENNIE P. THOnNE.

of a carriage therefor, 

